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{
guint j;
double squaresum = 0.0;
double RMS = 0.0;
double RMS_dB = 0.0;
static int threshold_dB = -80;
static long int sample = 0;
double timepoint;
/*
* process data here
* input sample data enters in *in_data as 8 or 16 bit data
* samples for left and right channel are interleaved
*/
/*
for(j = 0; j < num_samples; j++) {
(*out_data)[j] = in_data[j];
squaresum += in_data[j] * in_data[j];
}
RMS = sqrt (squaresum / (float) num_samples);
printf ("RMS for this block : %f\n", RMS);
RMS_dB = 20 * log (RMS / 32767);
printf ("RMS in dB (for 16bit) : %f\n", RMS_dB);
*/
for(j = 0; j < num_samples; j++) {
(*out_data)[j] = in_data[j];
squaresum += pow ((double) in_data[j] / 32767.0, 2);
}
RMS = sqrt (squaresum / (float) num_samples);
RMS_dB = 10 * log (RMS);
sample += num_samples;
timepoint = sample / (44100.0 * 2);
if (RMS_dB > (double) threshold_dB)
{
/* printf ("Reached %d dB at %f sec (%f dB)\n",
threshold_dB, timepoint, RMS_dB);
*/
threshold_dB += 1;
}
/* printf ("RMS in dB (for 16bit) : %f\n", RMS_dB); */
printf ("%f %f\n", timepoint, RMS_dB);
}
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